ERROR non-zero exit value 2

[misskbar]

How can i fix this

Error:Execution failed for task ':app:dexDebug'.

com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/Library/Java/JavaVirtualMachines/jdk1.8.0_40.jdk/Contents/Home/bin/java'' finished with non-zero exit value 2

[livotov]

you should look for more information about the error, as your snippet does not contain any useful information. Check the log output above this message